WattCost

Data through June 2026

Running cost · Room Air Conditioners · ENERGY STAR certified

TCL H18W4KW-CA

The TCL H18W4KW-CA is certified at 938 kWh per year (based on 750 standardized hours), roughly $172 at the national average — though seasonal use means your real bill lands in a few months, not twelve. Even among certified models it's on the thirsty end: 76% more electricity than the median room air conditioner, ranked 399 of 439. The same unit costs $123 a year in Nevada but $494 in Hawaii — electricity rates, not the appliance, make the difference.

Uses 35% less energy than the U.S. federal minimum

Dimensions 15.3" H × 26" W × 27.5" D, 116 lb

Estimated annual running cost · U.S. average rate 18.3¢/kWh

$172/yr

$48 · cheapest certified room air conditioners$384 · priciest
Per month
$14.33
Per day
47¢
Certified use
938 kWh/yr
Cooling capacity
18,000 BTU/hr
CEER
14.4
Mounting
Straddles Window
Variable-speed compressor
Yes
260 kWh2,096 kWh
Where the TCL H18W4KW-CA (▮) sits among all 439 certified room air conditioners, by annual kWh

What it costs in every state

TCL H18W4KW-CA: 938 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$154
Alaska28.2¢$264
Arizona15.2¢$142
Arkansas14.1¢$132
California34.7¢$326
Colorado17.1¢$161
Connecticut24.3¢$228
Delaware19.3¢$181
District of Columbia24.4¢$229
Florida15.1¢$142
Georgia16.4¢$153
Hawaiipriciest52.7¢$494
Idaho14.4¢$135
Illinois19.9¢$186
Indiana17.5¢$164
Iowa15.9¢$149
Kansas15.7¢$147
Kentucky14.3¢$134
Louisiana13.5¢$126
Maine29.6¢$277
Maryland21.8¢$205
Massachusetts29.6¢$278
Michigan23.0¢$216
Minnesota17.5¢$164
Mississippi14.9¢$140
Missouri16.2¢$152
Montana15.1¢$142
Nebraska13.3¢$124
Nevadacheapest13.1¢$123
New Hampshire27.0¢$253
New Jersey24.9¢$234
New Mexico15.1¢$141
New York29.5¢$276
North Carolina14.7¢$138
North Dakota14.1¢$132
Ohio19.2¢$180
Oklahoma14.3¢$134
Oregon16.3¢$153
Pennsylvania21.7¢$204
Rhode Island29.2¢$274
South Carolina15.6¢$146
South Dakota15.4¢$144
Tennessee14.1¢$132
Texas15.9¢$149
Utah13.4¢$125
Vermont24.4¢$229
Virginia17.2¢$161
Washington14.9¢$140
West Virginia15.4¢$145
Wisconsin19.6¢$183
Wyoming15.2¢$143

Certified models closest in efficiency

room air conditioners within reach of 938 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich CCV18A30A938$172
HEMA DS-2W1822CI938$172
TCL H18W4KW938$172
TCL T18WQ2S938$172
Whirlpool WHAW-181IN938$172
Friedrich WHVT14B33A950$174

Run your own numbers

Your rate, your numbers

Per day
47¢
Per month
$14.34
Per year
$172

938 kWh/yr × 18.3¢/kWh = $172/yr

Prefilled with this model's certified 938 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh assumes 750 cooling hours per year (the DOE standard). In hot climates real usage can run well above that; in mild ones, below.

Questions, answered with the data

How much electricity does the TCL H18W4KW-CA use?
ENERGY STAR certifies the TCL H18W4KW-CA at 938 kWh per year. The certified annual kWh assumes 750 cooling hours per year (the DOE standard). In hot climates real usage can run well above that; in mild ones, below.
How much does the TCL H18W4KW-CA cost to run per month?
About $14.33 a month at the U.S. average residential rate (18.3¢/kWh) — 47¢ a day, or $172 a year. Your state's rate moves this up or down; see the table above.
Is the TCL H18W4KW-CA energy efficient?
It uses 76% more electricity than the median certified room air conditioner, which puts it among the least efficient certified models.
What does the TCL H18W4KW-CA cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $123 a year in Nevada (13.1¢/kWh) and $494 in Hawaii (52.7¢/kWh).

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